# iconv.m4 serial 26
dnl Copyright (C) 2000-2002, 2007-2014, 2016-2023 Free Software Foundation,
dnl Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Bruno Haible.

AC_PREREQ([2.64])

dnl Note: AM_ICONV is documented in the GNU gettext manual
dnl <https://www.gnu.org/software/gettext/manual/html_node/AM_005fICONV.html>.
dnl Don't make changes that are incompatible with that documentation!

AC_DEFUN([AM_ICONV_LINKFLAGS_BODY],
[
 dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
 AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
 AC_REQUIRE([AC_LIB_RPATH])

 dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
 dnl accordingly.
 AC_LIB_LINKFLAGS_BODY([iconv])
])

AC_DEFUN([AM_ICONV_LINK],
[
 dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
 dnl those with the standalone portable GNU libiconv installed).
 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

 dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
 dnl accordingly.
 AC_REQUIRE([AM_ICONV_LINKFLAGS_BODY])

 dnl Add $INCICONV to CPPFLAGS before performing the following checks,
 dnl because if the user has installed libiconv and not disabled its use
 dnl via --without-libiconv-prefix, he wants to use it. The first
 dnl AC_LINK_IFELSE will then fail, the second AC_LINK_IFELSE will succeed.
 am_save_CPPFLAGS="$CPPFLAGS"
 AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])

 AC_CACHE_CHECK([for iconv], [am_cv_func_iconv], [
   am_cv_func_iconv="no, consider installing GNU libiconv"
   am_cv_lib_iconv=no
   AC_LINK_IFELSE(
     [AC_LANG_PROGRAM(
        [[
#include <stdlib.h>
#include <iconv.h>
        ]],
        [[iconv_t cd = iconv_open("","");
          iconv(cd,NULL,NULL,NULL,NULL);
          iconv_close(cd);]])],
     [am_cv_func_iconv=yes])
   if test "$am_cv_func_iconv" != yes; then
     am_save_LIBS="$LIBS"
     LIBS="$LIBS $LIBICONV"
     AC_LINK_IFELSE(
       [AC_LANG_PROGRAM(
          [[
#include <stdlib.h>
#include <iconv.h>
          ]],
          [[iconv_t cd = iconv_open("","");
            iconv(cd,NULL,NULL,NULL,NULL);
            iconv_close(cd);]])],
       [am_cv_lib_iconv=yes]
       [am_cv_func_iconv=yes])
     LIBS="$am_save_LIBS"
   fi
 ])
 if test "$am_cv_func_iconv" = yes; then
   AC_CACHE_CHECK([for working iconv], [am_cv_func_iconv_works], [
     dnl This tests against bugs in AIX 5.1, AIX 6.1..7.1, HP-UX 11.11,
     dnl Solaris 10.
     am_save_LIBS="$LIBS"
     if test $am_cv_lib_iconv = yes; then
       LIBS="$LIBS $LIBICONV"
     fi
     am_cv_func_iconv_works=no
     for ac_iconv_const in '' 'const'; do
       AC_RUN_IFELSE(
         [AC_LANG_PROGRAM(
            [[
#include <iconv.h>
#include <string.h>

#ifndef ICONV_CONST
# define ICONV_CONST $ac_iconv_const
#endif
            ]],
            [[int result = 0;
 /* Test against AIX 5.1...7.2 bug: Failures are not distinguishable from
    successful returns.  This is even documented in
    <https://www.ibm.com/support/knowledgecenter/ssw_aix_72/i_bostechref/iconv.html> */
 {
   iconv_t cd_utf8_to_88591 = iconv_open ("ISO8859-1", "UTF-8");
   if (cd_utf8_to_88591 != (iconv_t)(-1))
     {
       static ICONV_CONST char input[] = "\342\202\254"; /* EURO SIGN */
       char buf[10];
       ICONV_CONST char *inptr = input;
       size_t inbytesleft = strlen (input);
       char *outptr = buf;
       size_t outbytesleft = sizeof (buf);
       size_t res = iconv (cd_utf8_to_88591,
                           &inptr, &inbytesleft,
                           &outptr, &outbytesleft);
       if (res == 0)
         result |= 1;
       iconv_close (cd_utf8_to_88591);
     }
 }
 /* Test against Solaris 10 bug: Failures are not distinguishable from
    successful returns.  */
 {
   iconv_t cd_ascii_to_88591 = iconv_open ("ISO8859-1", "646");
   if (cd_ascii_to_88591 != (iconv_t)(-1))
     {
       static ICONV_CONST char input[] = "\263";
       char buf[10];
       ICONV_CONST char *inptr = input;
       size_t inbytesleft = strlen (input);
       char *outptr = buf;
       size_t outbytesleft = sizeof (buf);
       size_t res = iconv (cd_ascii_to_88591,
                           &inptr, &inbytesleft,
                           &outptr, &outbytesleft);
       if (res == 0)
         result |= 2;
       iconv_close (cd_ascii_to_88591);
     }
 }
 /* Test against AIX 6.1..7.1 bug: Buffer overrun.  */
 {
   iconv_t cd_88591_to_utf8 = iconv_open ("UTF-8", "ISO-8859-1");
   if (cd_88591_to_utf8 != (iconv_t)(-1))
     {
       static ICONV_CONST char input[] = "\304";
       static char buf[2] = { (char)0xDE, (char)0xAD };
       ICONV_CONST char *inptr = input;
       size_t inbytesleft = 1;
       char *outptr = buf;
       size_t outbytesleft = 1;
       size_t res = iconv (cd_88591_to_utf8,
                           &inptr, &inbytesleft,
                           &outptr, &outbytesleft);
       if (res != (size_t)(-1) || outptr - buf > 1 || buf[1] != (char)0xAD)
         result |= 4;
       iconv_close (cd_88591_to_utf8);
     }
 }
#if 0 /* This bug could be worked around by the caller.  */
 /* Test against HP-UX 11.11 bug: Positive return value instead of 0.  */
 {
   iconv_t cd_88591_to_utf8 = iconv_open ("utf8", "iso88591");
   if (cd_88591_to_utf8 != (iconv_t)(-1))
     {
       static ICONV_CONST char input[] = "\304rger mit b\366sen B\374bchen ohne Augenma\337";
       char buf[50];
       ICONV_CONST char *inptr = input;
       size_t inbytesleft = strlen (input);
       char *outptr = buf;
       size_t outbytesleft = sizeof (buf);
       size_t res = iconv (cd_88591_to_utf8,
                           &inptr, &inbytesleft,
                           &outptr, &outbytesleft);
       if ((int)res > 0)
         result |= 8;
       iconv_close (cd_88591_to_utf8);
     }
 }
#endif
 /* Test against HP-UX 11.11 bug: No converter from EUC-JP to UTF-8 is
    provided.  */
 {
   /* Try standardized names.  */
   iconv_t cd1 = iconv_open ("UTF-8", "EUC-JP");
   /* Try IRIX, OSF/1 names.  */
   iconv_t cd2 = iconv_open ("UTF-8", "eucJP");
   /* Try AIX names.  */
   iconv_t cd3 = iconv_open ("UTF-8", "IBM-eucJP");
   /* Try HP-UX names.  */
   iconv_t cd4 = iconv_open ("utf8", "eucJP");
   if (cd1 == (iconv_t)(-1) && cd2 == (iconv_t)(-1)
       && cd3 == (iconv_t)(-1) && cd4 == (iconv_t)(-1))
     result |= 16;
   if (cd1 != (iconv_t)(-1))
     iconv_close (cd1);
   if (cd2 != (iconv_t)(-1))
     iconv_close (cd2);
   if (cd3 != (iconv_t)(-1))
     iconv_close (cd3);
   if (cd4 != (iconv_t)(-1))
     iconv_close (cd4);
 }
 return result;
]])],
         [am_cv_func_iconv_works=yes], ,
         [case "$host_os" in
            aix* | hpux*) am_cv_func_iconv_works="guessing no" ;;
            *)            am_cv_func_iconv_works="guessing yes" ;;
          esac])
       test "$am_cv_func_iconv_works" = no || break
     done
     LIBS="$am_save_LIBS"
   ])
   case "$am_cv_func_iconv_works" in
     *no) am_func_iconv=no am_cv_lib_iconv=no ;;
     *)   am_func_iconv=yes ;;
   esac
 else
   am_func_iconv=no am_cv_lib_iconv=no
 fi
 if test "$am_func_iconv" = yes; then
   AC_DEFINE([HAVE_ICONV], [1],
     [Define if you have the iconv() function and it works.])
 fi
 if test "$am_cv_lib_iconv" = yes; then
   AC_MSG_CHECKING([how to link with libiconv])
   AC_MSG_RESULT([$LIBICONV])
 else
   dnl If $LIBICONV didn't lead to a usable library, we don't need $INCICONV
   dnl either.
   CPPFLAGS="$am_save_CPPFLAGS"
   LIBICONV=
   LTLIBICONV=
 fi
 AC_SUBST([LIBICONV])
 AC_SUBST([LTLIBICONV])
])

dnl Define AM_ICONV using AC_DEFUN_ONCE, in order to avoid warnings like
dnl "warning: AC_REQUIRE: `AM_ICONV' was expanded before it was required".
AC_DEFUN_ONCE([AM_ICONV],
[
 AM_ICONV_LINK
 if test "$am_cv_func_iconv" = yes; then
   AC_CACHE_CHECK([whether iconv is compatible with its POSIX signature],
     [gl_cv_iconv_nonconst],
     [AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
           [[
#include <stdlib.h>
#include <iconv.h>
extern
#ifdef __cplusplus
"C"
#endif
size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
           ]],
           [[]])],
        [gl_cv_iconv_nonconst=yes],
        [gl_cv_iconv_nonconst=no])
     ])
 else
   dnl When compiling GNU libiconv on a system that does not have iconv yet,
   dnl pick the POSIX compliant declaration without 'const'.
   gl_cv_iconv_nonconst=yes
 fi
 if test $gl_cv_iconv_nonconst = yes; then
   iconv_arg1=""
 else
   iconv_arg1="const"
 fi
 AC_DEFINE_UNQUOTED([ICONV_CONST], [$iconv_arg1],
   [Define as const if the declaration of iconv() needs const.])
 dnl Also substitute ICONV_CONST in the gnulib generated <iconv.h>.
 m4_ifdef([gl_ICONV_H_DEFAULTS],
   [AC_REQUIRE([gl_ICONV_H_DEFAULTS])
    if test $gl_cv_iconv_nonconst != yes; then
      ICONV_CONST="const"
    fi
   ])

 dnl A summary result, for those packages which want to print a summary at the
 dnl end of the configuration.
 if test "$am_func_iconv" = yes; then
   if test -n "$LIBICONV"; then
     am_cv_func_iconv_summary='yes, in libiconv'
   else
     am_cv_func_iconv_summary='yes, in libc'
   fi
 else
   if test "$am_cv_func_iconv" = yes; then
     am_cv_func_iconv_summary='not working, consider installing GNU libiconv'
   else
     am_cv_func_iconv_summary='no, consider installing GNU libiconv'
   fi
 fi
])

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